School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea.
School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea.
Environ Pollut. 2018 Jun;237:878-886. doi: 10.1016/j.envpol.2017.12.112. Epub 2018 Mar 7.
This study incorporated stable isotope analyses with chemical analyses to determine the origin and migration of sulfur sources in East Asia, and these findings were compared with our decadal research from 2000 to 2001 and 2002 to 2003. The multiple sulfur isotope composition (S, S and S) of the dissolved sulfate in precipitation was first measured from 2011 to 2013 in Seoul, South Korea. The δS values were -1.1‰ to 7.9‰ (avg. 3.6‰), strongly suggesting that sulfur derived from the combustion of Chinese coal is the predominant source of sulfate in the Seoul region. Low NO/SO ratios in the precipitation samples indicated an insignificant effect of sulfur from vehicle exhaust. The seasonal variation of δS values appears to be caused by increasing biogenic sulfur activity during the spring and summer seasons. The some ΔS values (0.13‰-0.16‰) measured in the three samples were sufficiently small; thus, whether these values can be attributed to mass-independent fractionation remains unclear. Measuring the ΔS anomalies in dissolved sulfate provides valuable insights for identifying the sources of sulfur transferred from the stratosphere to the troposphere and upper troposphere.
本研究结合稳定同位素分析和化学分析，以确定东亚硫源的起源和迁移，这些发现与我们 2000-2001 年和 2002-2003 年的十年研究进行了比较。首次对 2011 年至 2013 年韩国首尔地区降水的溶解硫酸盐进行了多种硫同位素组成（δ34S、δ33S 和 δ32S）的测量。δ34S 值为-1.1‰至 7.9‰（平均值为 3.6‰），强烈表明源自中国煤炭燃烧的硫是首尔地区硫酸盐的主要来源。降水样本中低的 NO/SO 比值表明车辆尾气硫的影响不大。δ34S 值的季节性变化似乎是由于春季和夏季生物成因硫活性增加所致。在三个样本中测量到的一些 δ34S 值（0.13‰-0.16‰）足够小；因此，这些值是否可以归因于质量独立分馏仍不清楚。测量溶解硫酸盐中的ΔS 异常为识别从平流层向对流层和上对流层转移的硫源提供了有价值的见解。
